package com.java.servlet;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.util.List;

/**
 * @author jingjintao
 * @date 2021/6/18 - 23:25
 **/
public class UploadServlet extends HttpServlet {

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {


//        ServletInputStream is = req.getInputStream();
//
//        byte[] buffer = new byte[1024000];
//        int len = is.read(buffer);
//        System.out.println(new String(buffer,0,len));

        //1 先判断上传的数据是否多段数据（只有是多段的数据，才是文件上传的）
        if(ServletFileUpload.isMultipartContent(req)){
            //创建FileItemFactory工厂实现类
            FileItemFactory fileItemFactory = new DiskFileItemFactory();
            // 创建用于解析上传数据的工具类ServletFileUpload类
            ServletFileUpload servletFileUpload = new ServletFileUpload(fileItemFactory);
            try {
                // 解析上传的数据，得到每一个表单项FileItem
                List<FileItem> list = servletFileUpload.parseRequest(req);
                // 循环判断，每一个表单项，是普通类型，还是上传的文件
                for (FileItem fileItem : list) {
                    if(fileItem.isFormField()){
                        //普通表单项
                        System.out.println("表单项的name属性值:"+fileItem.getFieldName());
                        // 参数UTF-8.解决乱码问题
                        System.out.println("表单项的value属性值:"+fileItem.getString("UTF-8"));

                    }else{
                        //上传的文件
                        System.out.println("表单项的name属性值:"+fileItem.getFieldName());
                        System.out.println("上传的文件名:"+fileItem.getName());
                        //文件上传
                        fileItem.write(new File("e:\\"+fileItem.getName()));
                    }
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}
